The whereabouts of US Army Staff Sgt. Emil Rivera-Lopez, who participated in a training mission off the coast of Yemen on August 25, have been declared unknown (?), according to the Pentagon.

WASHINGTON (Sputnik) — The whereabouts of US Army Staff Sgt. Emil Rivera-Lopez, who participated in a training mission off the coast of Yemen on August 25, have been declared unknown, the US Department of Defense said in a release on Thursday.

"The Department of Defense announced today the identity of a soldier listed as Duty Status Whereabouts Unknown (DUSTWUN)," the release stated. "The announcement resulted from an Aug. 25 training incident off the coast of Yemen, where the soldier was supporting US Central Command operations."

The designation is used when a commander thinks a soldier, sailor or airman may be a casualty whose absence is involuntary, but does not believe there is enough evidence to make a definite determination the soldier has been missing, captured or dead, according to the Defense Department.

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O Almighty Lord God, who neither slumberest nor sleepest; Protect and assist, we beseech thee, all those who at home or abroad, by land, by sea, or in the air, are serving this country, that they, being armed with thy defence, may be preserved evermore in all perils; and being filled with wisdom and girded with strength, may do their duty to thy honour and glory; through Jesus Christ our Lord. Amen.